In
early
1986, SBS introduced 20 air-conditioned
version of the Nissan Diesel U31SCN. They were registered in the range of SBS10Y to
SBS29U. These buses were assembled by Nissan, using Fuji Heavy Industries
bodies. When these buses were approaching the 15-year statutory age, they were
all deployed on service 15. Upon reaching the statutory age
in 2000, some of the buses were retained
as training buses. As of December 2002, only 6
U31SCNs remained. They are SBS21R,
SBS24H, SBS25E, SBS26C,SBS28Y
and SBS29U. In June 2003, the remaining
U31SCNs were retired from training duties.